[Discuss-gnuradio] Tagged Stream Blocks with HackRF

[Florian Adamsky]

Dear all,

I have problems to get the example "wifi_tx.grc" from gr-ieee802-11 [1]
to work with my HackRF device. In the example, I just replaced the USRP
sink with the osmocom sink and tried to run it. I always get underrun
errors:

,----
| Executing: /usr/bin/python2 -u /home/cit/Dojo/sdr/wifi_tx/wifi_tx.py
|
| linux; GNU C++ version 6.3.1 20170306; Boost_106300; 
UHD_003.010.001.001-0-unknown
|
| MAPPER: encoding: 0
| set_min_output_buffer on block 9 to 397056
| set_min_output_buffer on block 11 to 397056
| set_min_output_buffer on block 13 to 397056
| set_min_output_buffer on block 14 to 397056
| set_min_output_buffer on block 16 to 397056
| gr-osmosdr 0.1.4 (0.1.4) gnuradio 3.7.11
| built-in sink types: uhd hackrf bladerf
| Using HackRF One with firmware 2017.02.1
| set_min_output_buffer on block 28 to 96000
| set_min_output_buffer on block 31 to 100000
| 
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
| >>> Done
`----

I tried the above mentioned example with GNU Radio 3.7.11 and 3.7.9 on
two different computers with the same result. I also tried the latest
gr-osmosdr v0.1.4-91-gcf954948 version but without any luck. I'm also
using the latest firmware (2017.12.01) of my HackRF device.

I asked [2] Bastian Bloessel, the author of gr-ieee802-11, but it seems
like it is a general problems with tagged stream blocks and my HackRF
device. As he mentioned, I created a simple GNU radio file like the
following:

Message Strobe -> Random PDU -> PDU to Tagged Streams -> Osmocom Sink

Also in this example, I get a lot of underrun errors. Does anyone have
an idea what might be the problem?

GNU Radio Version: 3.7.11 and 3.7.9
HackRF Kernel Module: 4.10.13-1-ARCH
Gr-osmosdr: 0.1.4 and v0.1.4-91-gcf954948

Thanks in advance!

Cheers

Links:
[1] https://github.com/bastibl/gr-ieee802-11
[2] https://github.com/bastibl/gr-ieee802-11/issues/77
--
Dr. Florian Adamsky
http://florian.adamsky.it/